651 | The National Groundwater and Contaminated Land Centre (NGWCLC) |
652 | The evaluation of a Philips ammonium ion selective electrode (220/14/T) |
653 | The greening of Grasmere: its plankton periodicity in 1988 |
654 | A strategic review of the petroleum refinery Industry Sector |
655 | Guidelines for river corridor surveys in the NRA : February 1992. draft 3 |
656 | Second annual review of the Sid/Otter catchment management plan 1999 |
657 | Contribution of small streams to potential fish production in the Conwy catchment |
658 | NRA strategy for reducing the concentration of pesticides in controlled waters |
659 | The ecology and management of riverine trees : interim report |
660 | Low-cost modifications of the Crump weir to improve fish passage |
661 | Policy and practice for the protection of groundwater - Thames region appendix |
662 | Policy and practice for the protection of floodplains |
663 | 'Sea Vigil' water quality monitoring : the Wash 1992-1993 |
664 | Second annual review of the Seaton, Looe and Fowey catchment management plan |
665 | The Yarrow catchment : recommendations for statutory water quality objectives |
666 | Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere |
667 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
668 | Guidance on the use of Bioassays in Ecological Risk Assessment |
669 | The National Rivers Authority employee attitude survey : summary |
670 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
671 | Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A) |
672 | Pesticides in the aquatic environment 1997 : executive summary |
673 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |
674 | Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A) |
675 | The Louth coastal catchment management plan : final report |